Revolving chair.



No. 629,676. Patented July 25, I899. J. M. GERMANSUN.

REVOLVING CHAIR.

(Application filed Apr. 14, 1899.) (No Model.)

/i\ 9 i 12 if 6* $0 K I 7? 7 q 1 13 9 f x a .UNITED STATES PATENT FErcE.

JULIUS M. GERMANSON, OF MILWVAUKEE, \VISCONSIN, ASSIGNOR TO THE OF SAMEPLACE.

REVOLVING CHAIR.

s'rnczmcn'non forming part of Letters Patent No. 629,676, dated July 25,1 899.

Application filed April it, 1899.

To aZZ whom it may concern.-

Be it known that I, JULIUs M. GERMANSON,

of Milwaukee, in the county of Milwaukee and Patent; and with thisprimary object in View the invention consists of the devices and partsor theirequivalents, as hereinafter more fully pointed out.

In the accompanying drawings, Figure 1 is an elevation of achair-ironconstructed in accordance with my improvements, parts being insection and parts broken away. Fig. 2 is a plan view of the top of thehub, the segmental angular lug thereof being in horizontal section. Fig.3 is a plan view of the combined hand-wheel and nut. Fig. 4: is a detailview of the collar, and Fig. 5 is an elevation of the hand-wheel andnut.

Referring to the drawings, the numeral 6 indicates the hub of thechair-iron, which is provided with the usual grooves 7 for receiving theupper portions of the legs (not shown) on which the hub is supported,said legsbeing held in place by means of screws passed through openingsSin the top portion or flange 9 of the hub. The hub is provided with acentral vertical plain or unthreaded opening 10 throughout its length,and at the upper end of this opening the bordering wall thereof is cutaway to form a shoulder 11, which is located just below the upperextremity of the opening. Resting upon this shoulder is a collar 12,said collar provided in its top edge at diametrically opposite pointswith recesses or depressions 13 13. Similar recesses or depressions 1313 may be formed on the lower Serial No. 712,992. (No model.)

edge of the collar, so. that the collar may be placed into the hub witheither edge downpassed through the collar and through the centralvertical opening of the hub, and-this screw-spindle is providedlengthwise thereof with a groove 15, with which groove a lug 16,

extending inwardly from the collar 12, is

adapted to engage. The upper end of the screw-s pindle is provided withthe usual head dle is attached to the chair-seat is connected. A nut 19engages the spindle, and the lower end of this nut normally extends avery slight distance into the upper end of the opening 10 of the huband'rests upon the upper edge of the collar 12, said lower edge of thisnut being provided at diametrically opposite points with lugs 20 20,which normally engage the recesses 13 13 or 13 13 of the collar. Theextreme upper end of the opening 10 is enlarged somewhat in diameter, asindicated at 21, so that the circumferential edge of the lower end ofthe nut will not'contact' with the wall of the opening, therebydecreasing friction to the minimum. The upper end of thenut is formed orprovided with a hand-wheel 22 for convenience in turning the same.Beneath this hand-wheel the nut is cut out annularly to form a lowershoulder 23. The top por tion or flange 9 of the hub has extendingupwardly therefrom and preferably integral into the cut-out portion ofthe nut and at a slight distance above the shoulder 23, the distancebeing such as to permit the nut to 'be raised, so that the lugs 20thereof are or depressions 13 13 or 13 13 of the collar and to bear onthe edge of said collar. I prefer to provide a lug 24 of segmentalshape, yet this specific construction is not ab solutely necessary,inasmuch as two lugs could be provided with advantage, extend ing atdifferent points from the top portion 9.

In the operation of the invention when the chair-seat is revolved by aperson'occup'ying ward. A screw-spindle 14 is adapted to be.

17, to which the flange 18 by which the spintherewith an angular lug 2a,the inwardlyextending portion thereof extending inwardly the seat thescrew-spindle 14, through the engagement of the lug 16 of the collarwithbrought out of engagement with the recesses While the groove 15 ofthe spindle, carries with it the collar 12, and by reason of the factthat the depressions or recesses of said collar are normally engaged bythe lugs 20 of the nut said nut is also carried with the spindle, withthe result that the three parts referred to are revolved together, thecollar and the lower extremity of the nut revolving freely in' the upperportion of the opening of the hub. It follows from this that the nut isnormally held to the screw in the rotation of said screw, andconsequently there is no vertical movement at all of the parts,althoughthe free rotation of thechair-seat is provided for. Whenever itis desired to adjust the chairseat vertically, said seat is held againstrotation by one hand, while the other hand grasps the handwheel androtates the nut 19. The forcible rotation of the nut carries the lugs 20thereof out of engagement with the recesses of the collar 12 and saidlugs therefor with the con tinued rotation ride around on the upper edgeof the collar. By this continued rotation of the nut the screw-spindleis either raised or lowered in accordance with the direction in whichsaid nut is turned. The angular lug 24: serves the function ofpermitting of the disengagement of the lugs 20 from the recesses of thecollar 12, but yet prevents said nut from movement longitudinally on thescrewspindle. As the nut is held against longitudinal movement, it ofcourse follows that the spindle must move vertically, said spindle beingprevented from turning by reason of the engagement of the lug .16 withthe groove 15 of said spindle.

In the Morgan patent, No. 537,988, dated April 23, 1895, and referred toat the outset of this specification the shoulder corresponding to theshoulder 11 of the present application was arranged in the borderingwall of the opening of the hub, near the lower end of said opening, andin place of the collar 12 a long sleeve was inserted in the hub andrested upon said lower shoulder. The adjustingnut also extended quite adistance into the opening of the hub in order to engage the u pper edgeof this long sleeve. Furthermore, the nut was provided with an annulargroove which was engaged by a screw, the groove being of suificientwidth to permit of a vertical play of the nut equal to the verticalextent of the projection on the lower edge of said nut. Letters Patentthe lower end of the nut is shown as provided with only one projectionadapted to engage a single recess or depression at the upper edge of thesleeve. The construction just outlined has been found in practice opento objections, the most serious of which is the wabbling and rattlingwhich are necessarily incidental to such construction; With a longsleeve such as shown in i said patent and with a nut extending for adistance into the hub if the parts were fitted tight enough to preventwabbling or rattling of shaking.

It will also be noted that in said hub, whereby a long solid bearing isformed throughout practically the whole length of the opening, thustaking away any chance From the fact that in the patent referred to thenut extends for a considerable distance into thebore of the hub anadjusting screw must necessarily be employed, extending laterallythrough the hub and entering an annular groove in the nut, in order toprovide for a slight vertical play of the nut. By my improvedconstruction the screw can be entirely omitted and the same functionsecured by means of the ang'ularlug' extending upwardly from the topportion of the hub. In my construction the collar is provided with thetwo recesses or depressions and the lower end of the nut with the twolugs or projections, for the reason that one depression and one engaginglug would. not

work successfully in this form of construction owing to the fact that acollar such as 12 would necessaril y til-t upon the disengage ment of asingle lug from a single recess or depression.

A construction of chair-iron of the form herein shown and described iscapable of being manufactured much cheaper than the form covered inLetters Patent No. 537,988, dated April 23, 1895, inasmuch as it is notnecessary to provide for accurately fitting the nut into the bore of thehub, and consequently lathework is thereby avoided and simplicity ofconstruction also thereby secured.

In my form of construction by providing a segmental angular-lug 24 Isecure greater simplicity in adjusting the parts of the chair-irontogether. For instance, the nut can first be turned onto the spindlesuch a limited distance' that the end of the spindle will not projectthrough the nut. The nut can now be inserted under theinwardly-extending lip of the segmental lug. By now holding the spindleagainst rotation and turning the nut said spindle will be turned downinto the hub. This arrangement obviates the necessity of employing a lugor lugs detachably secured to the top of the hub and screwed down toplaceafter the parts have been secured together.

What I claim as my invention is 1. The combination, of a hub having avertical opening, the wall of the opening at or near the upper end ofsaid opening being provided with a shoulder, a loose collar supported onthe shoulder,a screw-threaded spindle pass ing through the collar andextending freely into the opening of the hub, a nut engaging the spindleand supported on and releasably engaging the collar, means for normallyrelcasably locking the spindle, collar, and nut to revolution together,and means adapted, when the nut is independently turned, for causing thespindle to have vertical movement in the collar, while the nut is heldagainst vertical movement on the spindle.

2. The combination, of a hub having a vertical opening, the wall of theopening at or near the upper end of said opening being provided with ashoulder, a loose collar supported on the shoulder, said collar being,provided with depressions or recesses in its edge, a screw-threadedspindle passing through the collar and extending freely into the openingof the hub, a nut engaging the spindle and supported on the collar, andprovided with lugs normally fitting the recesses of the collar tothereby lock the nut to said collar, said nut adapted to have a slightvertical play in order to disengage the lugs from the recesses, andmeans for normally holding the collar to rotation with the spindle, andmeans adapted, when the nut is released from the collar, and when saidnut is turned independently, for causing the spindle to move verticallyin the collar.

3. The combination, of a hub having a vertical opening, the wall of theopening at or near the upper end of said opening being provided with ashoulder, a loose collar supported on the shoulder, said collar providedwith an inwardly-projecting lug, a screw-threaded spindle passingthrough the collar and extending freely into the opening of the hub,said spindle provided with a groove which is engaged by the lug of thecollar, a nut. supported on and releasably engaging the collar, wherebythe spindle, collar, and nut are normally rotatable together, and meansfor preventing vertical movement of the nut on the spindle.

4. The combination, of a hub having a vertical opening, the wall of theopening at or near the upper end of said opening being provided with ashoulder, and said hub having an angular lug or lugs projecting upwardlyfrom the upper portion thereof, a loose collar supported onvtheshoulder, a screw-threaded spindle passing through the collar andextending freely. into the opening of the hub, a nut supported on andreleasably engaging the collar, said nut provided with a shoulder abovewhich the angular lug or lugs is or are adapted to project to such anextent as to provide for a slight vertical play of the nut, means fornormally releasably locking the spindle, collar, and nut to revolutiontogether, and means adapted, when the nut is independently turned, forcausing the spindle to have vertical movement in the collar, while thenut is held against vertical movement on the spindle.

5. The combination, of a hub having a ver-' tical opening, the wall ofthe opening at or near the upper end of said opening being provided witha shoulder, and said hub having a segmental, angular, lugprojectingupwardly therefrom, said lug being integral or adapted to be held inpermanent connection with the top of the hub, a loose collar supportedon the shoulder, ascrew-threaded spindle passing through the collar andextending freely into the opening of the hub, a nut supported on andreleasably engaging the collar, said nut provided with a shoulder abovewhichthe shoulder, a screw-threaded spindle pass-l ing through thecollar and extending freely into the opening of the hub, a nut extendingfor a slight distance into the upper end of the opening of the hub, andreleasably engaging the collar, means for normally releasably lookingthe spindle, collar, and nut to revolution together, and means adapted,when the nut is independently turned, for causing the spindle to havevertical movement in the collar, while the nut is held against verticalmovement on the spindle.

7. The combination, of a hub having a vertical opening, the wall of theopening near the upper end of said opening being provided with ashoulder, a loose collar supported on the shoulder, a screw-threadedspindle passing through the collar and extending freely into the openingof the hub, a nut extending for a slight distance into the upper end ofthe opening of the hub, but free from contact with the bordering wall ofsaid opening, and releasably engaging the'collar, means for nor mallyreleasably locking the spindle, collar, -and nut to revolution together,and means adapted, when the nut is independently turned, for causing thespindle to have vertical movement in the collar, while the nut is heldagainst vertical movement on the spindle.

8. The combination, of a hub having a vertical opening, the wall of theopening near the upper end of said opening being provided with ashoulder, a loose collar supported on the shoulder and provided withdepressions or recesses in its edge, and also provided with aninwardly-extending lug, a screw-threaded spindle passing through thecollar, and extending freely into the opening of the hub, said spindleprovided with a vertical groove engaged by the inwardly-extending lug ofthe collar, a nut engaging the spindle, said nut having its lowerend'extending into the opening of the hub for a limited distancesufficient ficient distance above the shoulder to permit to cause thelower end of the nut to engage a slight vertical play of the nut. 10'

the collar, said lower end of the nut provided In testimony whereof Iaflix my signature with depending lugs which normally engage in presenceof two witnesses.

the depressions or recesses of the collar, and JULIUS M. GERMANSON. anangularlug extending upwardly from the Vitnesses: top of the hub, andengaging over a shoulder A. L. MoRsELL formed on the nut, said lugextending a suf- \V. J. POTTER.

